# Homework regarding pressure XD

1. An underwater diver swims from the water surface P down to the seabed Q. He is cleaning the sea from unwanted object such as a box.

a) What is the pressure at the water surface P??

b) The box is 10m below the surface P and the density of the sea water is 1150kg/m(cubed). What is the pressure of the sea water on the top surface of the box?

2. Well the only equation i know is Pressure = Force/Area

## The Attempt at a Solution

tiny-tim
Homework Helper
Welcome to PF!

Hi Laura! Welcome to PF! The box is 10m below the surface P and the density of the sea water is 1150kg/m(cubed). What is the pressure of the sea water on the top surface of the box?

Well the only equation i know is Pressure = Force/Area

Draw the box, with a column of water on top of it, stretching all the way to the surface …

what is the weight of the column of water …

so what is the force on the box …

then use Pressure = Force/Area Hi Laura! Welcome to PF! Draw the box, with a column of water on top of it, stretching all the way to the surface …

what is the weight of the column of water …

so what is the force on the box …

then use Pressure = Force/Area Thanks alot =] 